Thread-cutter.



M. G. HEGKAMAN. THREAD CUTTER. APPLICATION FILED rmmv, 1912.

1,034,450. Patented Aug. 6, 1912.

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AFN C.

THREAD-CUTTER.

Specification of Letters Patent.

Application filed February 17, 1912.

Patented Aug. 6,1212. Serial No. 678,293.

T 0 all whom it may concern:

Be it known that 1, MICHAEL C. Hccrm- MAN, a citizen of the UnitedStates, residing at Yates, in the county of Dawson and State of Montana,have invented certain new and useful Improvements in ThreadCutters, ofwhich the following is a specification, reference being had to theaccompanying drawings.

This invent-ion relates to new and useful improvements in thread cuttersand more particularly to a device adapted to be operated by a bit braceor other similar tool, and used for cutting threads on bolts, smallrods, etc., and has for its object to provide a device of this characterso constructed that when the required number of threads have been cut onthe bolt, the bolt will release itself from the dies by engagement withthe clamping member which holds the dies in place.

Another object of the invention is to provide a device of this characterwhich will possess advantages in points of eiiiciency and durability, isinexpensive to manufacture and at the same time is simple inconstruction and operation.

With the above and other objects in view the invention consists in thenovel features of construction and the combination and arrangement ofparts hereinafter more fully described pointed out in the claim andshown in the accompanying drawings; in which Figure 1 is a sideelevation; Fig. 2 is an end elevation, Fig. 3 is a sectional view on theline 3-3 of Fig. 1; and Fig. t is a sectional view on the line 4. 1 ofFig. 1.

Referring more particularly to the drawings 1 indicates the cylindricalbody having a stem 2 formed integral with one end thereof, said stemhaving a substantially rectangular head 8 formed thereon adapted to beinserted in the socket of a brace. The body 1 is bifurcated to form theopen ended slots 1, and the rigid jaws 5,said jaws being provided withthe recesses 6 having grooves 7 formed therein. Thread cutting dies 8are slidably mounted in the recesses 6 and provided on each side withthe flanges 9 adapted to be disposed in the grooves 7 said dies havingtheir meeting ends provided with the semicircular threaded recesses 10adapted to form a circular opening when the inner ends of the dies arebrought together. The upper ends of the slots 4 are provided with therecesses llnadapted to receive one end of the leaf springs 12 which aresecured to the body 1 by means of the screws 13. The outer ends of thedies are provided with the recesses 14 adapt-ed to receive the otherends of said springs which are held in place by means of the screws 13,said springs being adapted to normally hold said dies in an openposition.

Elongated slots 15 are formed in the sides of the body and arranged inopposed rela tion, said slots being adapted to receive the movable bar16 having its ends disposed be yond the outer side of the body. Guidelugs 17 are formed on the side edges of said bar at its central portionand arranged in the slots 1.

A clamping ring 18 is slidably mounted on the body and provided with thecars 19 formed on opposite sides of the ring and having the threadedopenings 20 formed therein to receive the adjusting screws 21, saidscrews having their ends threaded into the threaded openings 22 formedin the ends of the bar 16. Jam nuts 23 are threaded on the screws 21 andbearing against the washers 2-1 arranged between the nuts and cars 19,said nuts being adapted to hold the screws in various adjustedpositions.

In cutting threads on bolts or other similar devices, the clamping ringis moved downwardly to force the dies 8 to a closed position, the body 1is then rotated, threading the dies on to the end of the bolt, cuttingthe thread on the boltas it travels along it until the end of the bolthas passed into the body far enough so that it strikes the bar 16,forcing the same upward and carrying the ring 18 with it, thus releasingthe springs 12 which force the dies apart and releases the bolt. Thebolt during the thread cutting operation is to be securely clampedagainst rotary movement in a vise or similar tool. 'Any desired numberof threads may be cut on the bolts or rods by the adjustment of the bar16 upon the screws 21.

From the above description taken in connection with the accompanyingdrawings the construction and operation of my improved thread cuttingdevice will be readily understood.

While I have shown and described the preferred form of my invention itwill be obvious that various changes in the details of construction andin the proportions may be resorted to for successfully carrying myinvention into practice without sacrificing any of the novel features ordeparting from the scope thereof.

What I claim is In combination with a thread cutting device, havingmovable cutting dies carried thereby, of a clamping ring, having earsformed thereon and arranged atdiametrically opposite points, said earshaving threaded openings formed therein, adjusting screws threaded intosaid openings, a cross bar, having threaded openings formed in its endsto receive the ends of the adjusting screws, said cross bar beingadapted for adjustment on said screws according to the number of threadsto be cut by the cutting dies.

In testimony whereof I hereunto aiiix my signature in the presence oftwo witnesses.

MICHAEL C. HECKAMAN.

Vitnesses J. M. JOHNSON, WM. FUNK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. O.

